Door-fastener.



' No. 663,036. Patented Dec. 4, I900.

' B. C. MITCHELL.

DUUR FASTENER. (Application filed m 24, 1900'.

(No Model.)

WITNESSES A TTORNE YS nrrnn STATES PATENT I @rricn.

BURTON GONYERS MITCHELL, OF RICHMOND, INDIANA.

DOOR-FASTENER.

SPECIFICATION forming part of Letters Patent No. 663,036, dated December 4, 1900. Application filed May 24, 1900. Serial Ila-117,832. kNo model.)

To ail whom, it may concern.-

Be it known that I, B URTON OONYERS MITCH- ELL, a citizen of the United States, and a resident ofNo.406 Tenth street,Richmond,county of VVayne,and State of Indiana,have invented certain new and useful Improvementsin Door- Fasteners, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof, in which similar letters of reference indicate corresponding parts.

This invention relates to an improved doorfastener to be used as an auxiliary lock to prevent persons from entering a room from the outside by means of a pass-key.

The nature and object of the invention will be fully understood from the following general description and the annexed drawings and will be subsequently pointed out in the claims.

Figure l of the accompanying drawings is a sectional plan view of part of a door and part of its jamb, showing part of a lock and a plan view of my invention applied. Fig. 2 is a perspective view of my improved fastener, showing its parts disassembled; and Fig. 3 is a similar view illustrating a modification of construction.

In the accompanying drawings, A designates a strip or plate of resilient sheet metal. This plate is bent at c, c, d, and (1, so that the three sides 0 c, c d, and d d will form proximately three sides of a rectangle. The distance from c to d is a little greater, however, than the distance from c to d. Thus the plate A is formed into a spring embodying the proximately rectangular bend c dd 01' with the wings a and e. The edges of the wing at are notched with slots 01/, as illustrated. B designates another piece of resilient sheet metal, bent at right angles at Z) and formed with the tines b and 1), adapted to fit into the notches a of the plate A.

To use my invention, when the door to which it is applied is open the bend a c d d is placed horizontally in the latch-mortise E, with the wings a and e resting horizontally against the jamb-plate G and the Wing an extending beyond the inside of the door-post E, as illustrated in Fig; 1. It will now be found that on account of the resiliency of the material and of the shape of the bend a c d d, which must be a little compressed in placing it in the latch-mortise F, the plate A will of itself firmly retain its position in the latchmortise, so that the door may be opened and closed Without disturbing it. When the door is closed, to fasten it the tines b b of the plate B are slipped into two opposite notches in the wing at, so that this plate B will bear against both the inside of the door D and the jamb E, as illustrated in Fig. 1. It will then be found that the door will be securely fastened to prevent it being opened from the outside; but when the plate B has been removed the door can again be easily opened and shut, leaving the plate or spring A all the time firmly resting in the latch-mortise ready to be used when it is required; or, if

it be desired, this plate A can be taken out of one door readily and as easily applied to another.

Fig. 3 illustrates another example of my invention, in which the wing a is perforated with holes 6 instead of being notched, as in Fig. 2, and the key G is used in these holes instead of the plate B, which, as before described, is to be used with a notched edge of the wing ct. This second example of my invention is otherwise used and applied as is hereinbefore described.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A doorfastener, comprising a single piece of resilient sheet metal, bent between its ends as specified, and formed into-a spring projection, adapted to be fitted into the latchmortise of a jamb-plate, by reason of its form and resiliency retain its position in said mortise, and having a notched or perforated wing extending beyond the door and door-jamb, to which it is applied, and a key formed and adapted as described, to engage such notches or perforations, and prevent the said door from being opened, all substantially as and for the purpose set forth.

2. In a door-fastener, the combination of the plate A, bent with the proximately rectangular bend c c, d d, and the wings a and e so as to form a spring, adapted as set forth to the latch-mortise of a jamb-plate, and to hold itself in position by reason of its form and resiliency, and having its wing a, formed once of two Witnesses, this 15th day of May, and adapted to be engaged by a key as speoi- 1900.

fied With a key adapted and formed to en- 1 gage the said wing a, all substantially as and BURTON OONYERS MITCHELL 5 for the purpose set forth. Witnesses:

In testimony that I claim the foregoing as WM. 0. FERGUSON,

my invention I have signed my name, in pres- THOMAS J. FERGUSON. 

